Montana Statewide Rule

Montana Light Trespass Nuisance Law

Some RestrictionsApplies statewide across Montana (2026)

Light trespass in Montana is addressed primarily through the general nuisance statute MCA 27-30-101. Excessive artificial light spilling onto neighboring property can constitute an actionable nuisance when it unreasonably interferes with use and enjoyment of property. Local ordinances supplement this framework.

Key Facts

Statute: MCA 27-30-101
Test: Reasonableness standard
Remedy: Damages and abatement
Civil action: MCA 27-30-201

Source: Montana Legislature

Full Breakdown

Montana does not have a specific statewide light trespass statute for private parties, but MCA 27-30-101 defines nuisance broadly to include anything offensive to the senses or obstructing free use of property. Courts apply a reasonableness test considering intensity, duration, location, and purpose of the light. MCA 27-30-201 allows civil suits for damages and abatement. Plaintiffs typically must show substantial interference beyond mere annoyance. Local jurisdictions like Bozeman, Missoula, and Whitefish have adopted specific lighting ordinances with measurable lumens or foot-candle limits. State-funded projects are separately regulated under MCA 17-7-216.

Violations & Penalties

Civil damages, injunctions, and abatement orders available under MCA 27-30-202. Local code citations may add fines from $100 to $500.

Frequently Asked Questions

What counts as actionable light trespass in Montana?

Light that substantially and unreasonably interferes with use and enjoyment of your property, considering intensity, duration, and purpose, may qualify as nuisance.

Can I get a court order to make a neighbor shield their lights?

Yes. Montana courts can issue injunctive relief and abatement orders under MCA 27-30-202 if you prove the lighting constitutes a nuisance.

Sources

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